Carabinieri paramilitary police in Chioggia, near the Cona migrant center, said the protest ended in the early hours of Tuesday.
Italian state RAI radio said migrants were protesting the alleged delay in medical assistance for a 25-year-old woman from Ivory Coast. The ill asylum-seeker died after an ambulance arrived, AP reported.
The radio said 25 frightened workers locked themselves inside offices when migrants set fires outside the center. No one was reported injured, and the protest ended after police mediated the dispute.
Il Sole-24 Ore radio said that before the protest, the center's management was being investigated after allegations of fraud and maltreatment.